It may be confusing when you call the removable tip a drip tip- you don't have to use it just when you are dripping. The smoke tech DC cartos come with a tip, but it's not for dripping. Some of the cartos have the plastic cap with a hole in them instead of a tip. Like mooreted I prefer having a tip on my carts- it feels better.
You can get dual coils if you want, but with the Vtube you don't have to. Get a good 2.5 to 3.0ohm resistance cartomizer or clearomizer so you can use the full range of the VV model that you have. Don't get anything below 2.0ohm or your Vtube will just adjust the voltage to the 3.7 range no matter how high you set the voltage. It is a safety feature so you don't break the low resistance cartomizer.
Hope that helps.
-Jason